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Description
Hollow mesoporous silica (HMS) nanoparticles offer a versatile platform for developing advanced delivery systems due to their high surface area, tunable porosity, and structural stability. Mesoporous silica nanoparticles (MSNs) offer exceptional potential for designing advanced pesticide delivery systems due to their high surface area, uniform pore distribution, and customizable pore structure. In this study, MSNs were utilized as the core material to develop a pH-responsive pesticide delivery system, incorporating copper ions (Cu²⁺) via polydopamine (PDA) chemistry for the controlled release of azoxystrobin (AZOX). The mesoporous structure, confirmed by SEM, TEM, and nitrogen adsorption/desorption analysis, provided a large surface area and interconnected pore network, ensuring high pesticide loading efficiency and the ability to confine AZOX molecules within the pores. The PDA coating served a dual purpose: first, as a pore blocker to retain the pesticide molecules inside the mesopores, and second, as a functional layer enabling strong Cu²⁺ chelation. The coordination bonding between Cu²⁺ and AZOX, facilitated by PDA, significantly slowed the release of AZOX, leveraging the mesoporous framework to enhance stability. The hierarchical porosity of the MSNs was critical in achieving sustained release profiles, with pH sensitivity introduced through the competitive binding of protons (H⁺) or hydroxide ions (OH⁻), which disrupted the "PDA–Cu²⁺–AZOX" bonds under specific environmental conditions. Detailed characterization of the porous network revealed a high pore volume and narrow pore size distribution, crucial for optimizing the loading and release kinetics of the pesticide. Dynamic contact angle measurements demonstrated that the PDA coating also enhanced leaf adhesion, improving deposition efficiency on crop surfaces. Fungicidal activity tests against Pyricularia oryzae showed superior efficacy of AZOX@MSNs-PDA-Cu compared to traditional formulations, with the mesoporous architecture playing a pivotal role in controlling the release dynamics and prolonging bioactivity. Bioactivity and biosafety evaluations demonstrated that poly(glycidyl methacrylate-co-acrylic acid) (P(GMA-AA)) onto HMS nanoparticles (HMS@P(GMA-AA)) exhibited superior pest control efficacy against Cnaphalocrocis medinalis larvae, with prolonged activity and no adverse effects on rice growth. These results highlight the potential of HMS@P(GMA-AA) as an innovative porous material for developing environmentally friendly, pH-responsive agrochemical This work underscores the critical role of mesoporous materials in pesticide delivery systems, highlighting how their structural and functional properties can be tailored for enhanced performance. By combining the benefits of high porosity, controlled release, and pH responsiveness, this approach represents a significant step toward sustainable and efficient agricultural practices.
| Country | Morocco |
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